Screen plate



F. JI OBRIEN SCREEN PLATE Dec. 25, 1945.

File d June 22, 1944 flieg.

APatented Dec. 25, 1945 UNITED STATES PATENT OFFICE` SCREEN PLATE y FredJ. OBrien, Mount Vernon, N. Y. Application June 22, 1944, Serial No.541,556

`1 Claim. (ci. 209-397) This invention relates generally to the art ofscreening but more particularly to certain new and useful improvementsin screen plates.

It has for one of its objects to provide a plate of this character forscreening machines which is simple and inexpensive in construction andwhich is so designed as to withstand maximum wear and provide for athorough tumbling or turning over action of the material to insureefficient screening results.

Another object of the invention is to provide a screen plate having rowsof punched holes therein whose opposite side edges extending lengthwiseof the screen are provided with turned-up rims or flanges which projectabove the surface lof the screen plate and intercept and deflect thematerial vertically and laterally as it iiows over the plate.

Other features of the invention reside in the construction andarrangement of parts hereinafter describedand particularly pointed outin the appended claim.

In the accompanying drawing:

Figure 1 is a sectional side elevation of a screeny body or frame havingmy improved screen plate installed thereon. Figure 2 is an enlargedfrag'- mentary top plan view thereof. Figure 3 is an enlarged crosssection taken on line 3 3, Figure 2. Figure 4 is a fragmentaryperspective View of the screen plate.

Similar characters of reference indicate corresponding parts throughoutthe several views.

Referring now to the drawing, I()I indicates al vibrating screen frameof any ordinary construction and Il indicates my improved screen plateor deck mounted in any suitable manner on such frame, it beingunderstood that the material is delivered to the upper or right hand endof the screen frame and flows downwardly thereover with the minusmaterial delivered below the screen plate and the positive materialdelivered over the lower or left hand end of the frame.

The screen plate consists of a sheet-like body of metal or otherappropriate material having rows of holes or openings I2 formed thereinby punching or the like, the rows Vbeing preferablyv vin Figures 2 and4. These holes are substantially square or rectangular in shape and areuniformly spaced, and at those opposite side edges thereof v extendinglengthwise of the screen or parallel to the ow of the material thereoverare upright flanges or rim-like projections I3 which extend slightlyabove the surface of the screen plate. By preference, these flanges areformed integrally with and bent upwardly from the screen plate and areof the same lengthwise dimension as the holes. It will be noted that theopposing flanges of a pair of holes in one row are centrally alined withthe holes in adjoining rows, thereby allowing the plus or oversizematerial to slide quickly over the screen plate and prevent itsplugging.

While manifestly simple in construction, this screen plate is eflcientin operation, its rim-like projections guide the material in a straightpath in the direction of flow thereof and impart suicient action to thematerial to keep it turning over and over and effecting completeseparation or screening of the minus material from the coarse or plusmaterial. Furthermore, the projections vailord increased wear to thescreen plate and do tangular in shape with those edges thereof instaggered relation being provided with flanges rising therefrom abovethe surface of the body and extending lengthwise thereof in the edgewisepath of flow of the material.

FRED J. OBRIEN.

